/// <summary>
/// Attempts to parse a move string in coordinate or long algebraic format.
/// </summary>
/// <param name="pos"></param>
/// <param name="moveStr"></param>
/// <param name="move"></param>
/// <returns></returns>
private static bool TryParseMoveCoordinateOrAlgebraic(MGPosition pos, string moveStr, out MGMove move)
{
moveStr = moveStr.ToLower();
// Sometimes promotions to Knight use the "k" instead of expected "n"
if (moveStr.EndsWith("k"))
{
moveStr = moveStr.Substring(0, moveStr.Length - 1) + "n";
}
MGMoveList moves = new MGMoveList();
MGMoveGen.GenerateMoves(in pos, moves);
foreach (MGMove moveTry in moves.MovesArray)
{
// Accept moves in any of multiple formats, including Chess 960 (for castling variation)
if (String.Equals(moveTry.MoveStr(MGMoveNotationStyle.LC0Coordinate), moveStr, StringComparison.OrdinalIgnoreCase) ||
String.Equals(moveTry.MoveStr(MGMoveNotationStyle.LC0Coordinate960Format), moveStr, StringComparison.OrdinalIgnoreCase) ||
String.Equals(moveTry.MoveStr(MGMoveNotationStyle.LongAlgebraic), moveStr, StringComparison.OrdinalIgnoreCase))
{
move = moveTry;
return(true);
}
}
move = default;
return(false);
}
/// <summary>
/// Attempts to parse a move string in coordinate or long algebraic format.
/// </summary>
/// <param name="pos"></param>
/// <param name="moveStr"></param>
/// <param name="move"></param>
/// <returns></returns>
private static bool TryParseMoveCoordinateOrAlgebraic(MGPosition pos, string moveStr, out MGMove move)
{
moveStr = moveStr.ToLower();
// Sometimes promotions to Knight use the "k" instead of expected "n"
if (moveStr.EndsWith("k"))
{
moveStr = moveStr.Substring(0, moveStr.Length - 1) + "n";
}
MGMoveList moves = new MGMoveList();
MGMoveGen.GenerateMoves(in pos, moves);
foreach (MGMove moveTry in moves.MovesArray)
{
if (moveTry.MoveStr(MGMoveNotationStyle.LC0Coordinate).ToLower() == moveStr ||
(moveTry.MoveStr(MGMoveNotationStyle.LongAlgebraic).ToLower() == moveStr))
{
move = moveTry;
return(true);
}
}
move = default;
return(false);
}
/// <summary>
/// Parses a move string from a specified starting position
/// (either algebraic or SAN format is accepted).
/// </summary>
/// <param name="pos"></param>
/// <param name="moveStr"></param>
/// <returns></returns>
public static MGMove ParseMove(MGPosition pos, string moveStr)
{
if (!TryParseMoveCoordinateOrAlgebraic(pos, moveStr, out MGMove move))
{
Position position = MGChessPositionConverter.PositionFromMGChessPosition(in pos);
PositionWithMove mfp = SANParser.FromSAN(moveStr, in position);
return(MGMoveConverter.MGMoveFromPosAndMove(in position, mfp.Move));
}
else
{
return(move);
}
}
static void TestZZ(string fen)
{
MGPosition curPosition = MGChessPositionConverter.MGChessPositionFromFEN(fen);
// Generate moves
MGMoveList moves = new MGMoveList();
MGMoveGen.GenerateMoves(in curPosition, moves);
foreach (var move in moves)
{
Console.WriteLine(move + " " + MoveStr(curPosition.AsPosition, move));
}
}
public static string AlgebraicMoveString(MGMove mgMove, Position pos)
{
string ret = null;
bool white = pos.MiscInfo.SideToMove == SideType.White;
MGPosition curPosition = MGChessPositionConverter.MGChessPositionFromFEN(pos.FEN);
// Generate moves
MGMoveList moves = new MGMoveList();
MGMoveGen.GenerateMoves(in curPosition, moves);
//if (white) mgMove = new MGMove(mgMove, true);
MGPosition newPosition = MGChessPositionConverter.MGChessPositionFromFEN(pos.FEN);
newPosition.MakeMove(mgMove);
bool isCheck = MGMoveGen.IsInCheck(newPosition, white);
if (mgMove.CastleShort)
{
ret = "O-O";
}
else if (mgMove.CastleLong)
{
ret = "O-O-O";
}
else
{
Square fromSquare = mgMove.FromSquare;
Square toSquare = mgMove.ToSquare;
Piece fromType = pos.PieceOnSquare(fromSquare);
Piece toPiece = pos.PieceOnSquare(toSquare);
if (fromType.Type == PieceType.Pawn)
{
string promoteChar = "";
if (mgMove.PromoteQueen)
{
promoteChar = "Q";
}
if (mgMove.PromoteBishop)
{
promoteChar = "B";
}
if (mgMove.PromoteRook)
{
promoteChar = "R";
}
if (mgMove.PromoteKnight)
{
promoteChar = "N";
}
if (mgMove.EnPassantCapture)
{
int newRank = white ? 6 : 3;
char newFile = char.ToLower(toSquare.FileChar);
ret = fromSquare.ToString().Substring(0, 1).ToLower() + "x" +
newFile + newRank;
}
else if (toPiece.Type == PieceType.None)
{
ret = toSquare.ToString().ToLower() + promoteChar;
}
else
{
ret = fromSquare.ToString().Substring(0, 1).ToLower() + "x" +
toSquare.ToString().ToLower() + promoteChar;
}
}
else
{
string captureChar = toPiece.Type == PieceType.None ? "" : "x";
List <MGMove> matchingCaptures = MovesByPieceTypeThatTakeOnSquare(mgMove.Piece, mgMove.ToSquareIndex, moves);
if (matchingCaptures.Count == 1)
{
ret = char.ToUpper(fromType.Char) + captureChar + toSquare.ToString().ToLower();
}
else
{
// Disambiguate
DifferBy differBy = MoveDifferFromAllOthersBy(matchingCaptures, mgMove);
string fileChar = fromSquare.FileChar.ToString().ToLower();
string rankChar = fromSquare.RankChar.ToString().ToLower();
if (differBy == DifferBy.File)
{
ret = char.ToUpper(fromType.Char) + fileChar + captureChar + toSquare.ToString().ToLower();
}
else if (differBy == DifferBy.Rank)
{
ret = char.ToUpper(fromType.Char) + rankChar + captureChar + toSquare.ToString().ToLower();
}
else
{
ret = char.ToUpper(fromType.Char) + fileChar + rankChar + captureChar + toSquare.ToString().ToLower();
}
}
}
}
if (isCheck)
{
return(ret + "+");
}
else
{
return(ret);
}
}